Abstract
Background and purpose Hydroxyapatite (HA) coating is believed to improve bone-implant ingrowth and long-term survival of prostheses. Recent studies, however, have challenged this view. Furthermore, HA particles may produce third-body wear and initiate aseptic loosening of implants. We report the performance of HA- and porous-coated acetabular cups in a prospective randomized trial. Methods This was an 8-year follow-up study of our previously published prospective randomized study to compare clinical outcomes, survival, periprosthetic bone mineral density, migration, and wear rates of HA- and porous-coated acetabular cups. Dual X-ray absorptiometry (DXA) and Ein Bild Roentgen Analyse (EBRA) measurements were used. 100 patients who underwent unilateral cementless total hip arthroplasty were randomized to either porous-coated cups or HA-coated cups. Patients were examined preoperatively and at 3, 6, and 9 months, and also 1, 3, and 8 years after surgery. 81 patients were available for 8-year follow-up, 40 with porous-coated cups and 41 with HA-coated cups. Results Age, sex, bone mineral density, and clinical results (Harris hip score) were similar in the 2 groups. The survival, wear, and migration patterns of the cups were also similar in both groups. The results of periprosthetic bone mineral density scans in region of interest 2 was in favor of the porous-coated cups, but there were no differences between the 2 groups in all the remaining regions of interest. Interpretation HA coating had no statistically significant effect on clinical results, survival, wear, or migration at the 8-year follow-up.
Original language | English |
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Journal | Acta Orthopaedica (Print Edition) |
Volume | 84 |
Issue number | 6 |
Pages (from-to) | 544-548 |
Number of pages | 5 |
ISSN | 1745-3674 |
DOIs | |
Publication status | Published - 31 Oct 2013 |
Keywords
- Absorptiometry, Photon
- Acetabulum
- Adult
- Aged
- Aged, 80 and over
- Arthroplasty, Replacement, Hip
- Bone Density
- Coated Materials, Biocompatible
- Durapatite
- Female
- Follow-Up Studies
- Hip Prosthesis
- Humans
- Kaplan-Meier Estimate
- Male
- Middle Aged
- Porosity
- Prosthesis Design
- Prosthesis Failure
- Reoperation
- Treatment Outcome